Nikola Todorov Kolev diesel engines claim 90% mechanical efficiency +30% FE levels - Fuel Economy, Hypermiling, EcoModding News and Forum

Vekke · 12-29-2011, 05:42 AM

HI,

I was contacted by this guy and he has some very nice looking engine consept going on. There is already working prototypes and priciples are patented. Trying get OEMs to produce it.

http://www.youtube.com/watch?v=YdB60...CrJjDrBDKCkxml

Spead the message around,

Vesa Tiainen

Frank Lee · 12-29-2011, 06:27 AM

Cool layout. Don't see how it gets a diesel cycle from 50 to 90% though.

jakobnev · 12-29-2011, 07:39 AM

In the info on youtube is says 90% mechanical. Quite different from 90% total.

It also says 140g/hp. (But i assume they mean hpH) That's 190g/kwh or 44% for diesel.

Vekke · 12-29-2011, 08:12 AM

Thanks for that correction I modified the topic... they claim 30% better FE and 90 % mechanical efficiency.

They are using basic other mechanical and injection components at the moment. More videos should come in the near future.

lowglider · 12-29-2011, 10:55 AM

Hi

I`m stupid when it comes to mechanicals, so can someone explain this a little better?

As far as I think I understand this engine does not use piston rods but uses more of a direct drive and thus has lower losses through friction and mechanical force transfer and because of the compact opposite side layout also needs less metal and hence less weight for the same amount of pwoer as would a traditional engine layout.
Sure looks interesting, yet I wonder how much stress the direct drive does on metals and how much vibration this design produces if compared with the traditional one.

Diesel_Dave · 12-29-2011, 12:07 PM

90% mechanical & 44% brake thermal efficiency are already within the range of modern diesels (at least at peak efficiency operating points). Interesting concept non the less. The potential mechanical efficiency advantage I see would be lower side forces on the piston.

I think the motion of the piston is still the basic slider-crank motion, so as far as the in-cylinder combustion, I think everything should be identical. Therefore closed cycle efficiency (and I assume pumping efficiency) should be the same as a conventional engine. So, the only advantage this engine would have efficiency-wise would be the mechanical efficiency. Even if the friction goes to zero, you're not going to get a 30% brake thermal efficiency advantage.

Interesting, but I guess I don't see a 30% efficiency improvement. The long-term durability of that "wristpin" joint concerns me too.